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颠换(transversion)

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在RNA聚合酶Ⅱ起始转录之后,起始复合物改变为延伸复合物(elongation complex),而这需要聚合酶复合物将一段短的DNA区解旋。对于线性DNA,这种解旋需要ATP、TFⅡE、TFⅡH和解旋酶活性,但是超螺旋DNA的解旋却不需要这些因子。试解释之。

请你提供两份计划:第一份要确证只有单一序列DNA被测序,第二份应该保证只有被测序的单一序列DNA是可转录的。

On the basis of this passage, what may be concluded about the real origin of stories “Sleeping Beauty” and “Cinderella”?

A. They were invented by Elizabeth Vergoose.
B. They were invented by Thomas Fleet.
C. They were invented by Charles Perrault.
D. Their writers are unknown.

概述机体对某特定抗原产生大量抗体并一直维持这种能力的机制。

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